No, I read the "win/win" as listing there only being two possible scenarios. They are saying you either win or you win. "Win/win" reads as "win or win", so there is your "either... or", but even then you don't need to say specific words to be able to imply exclusivity.

Example:
"You must be joking, and if not, then you are a fool" Notice how in that sentence I did not use "either/or", yet I still implied only two possibilities? Well, that sentence is homogenous to the sentence in OP's post. I just used "if/then" instead of "either/or".